Male bird seen displaying for two females on a large dam in the early morning at the beginning of spring. The Youtube video of this display can be seen on this link: https://www.youtube.com/watch?v=Vh7M0Pa1WGk

This sound clip is heavily edited to cut out unnecessary background noise because the call of this male is so extremely soft and very low in tone that it is barely audible in a recording. His calls, that sound like a low purr, can be heard at 4, 24 and 43 seconds in this sound clip. The last call at 43 seconds is the most audible of the 3 in this clip.

Two different vocalisations from the Hadada Ibis. Three Hadeda Ibis were seen roosting in a large suburban tree before sunrise in autumn. The raspy call throughout the sound clip is one of the birds, presumably a large juvenile begging. I have noticed this particular bird often makes this sound while with another one in the tree. The rest of the clip is interspersed with single calls from one of the birds, kind of warning the other two that it is almost time to fly off to feed for the day when it gets light enough to see. The end of the clip is when they all fly off together to feed.

A single bird was making this guttural noise from a large tree. It appeared as if it could be a male calling the female closer to inspect a site for a nest. After a while another bird flew in from another part of the tree and joined the first bird. They rubbed beaks for a brief moment and then sat together preening before flying off when they heard other Hadeda Ibises in the neighbourhood.

A pair seen mating in a large tree overlooking a river. The first bird calling in this clip is the female. The male then flies into the tree and calls before and during mating (the crescendo), then the female calls the single note calls right at the end of this clip.
The video of them mating and where the soundtrack is from, can be seen here: https://www.youtube.com/watch?v=gBkJqm8mBD8

Six single note calls merged into this sound clip by one bird sitting at the top of a very tall tree and calling for about 20 minutes. Have removed the long silent parts from this clip. Recorded early in the morning in early spring.